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Journal articles on the topic 'Disturbance factor'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

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1

Liu, Xiaolong, Zhengtao Shi, Guangcai Huang, Yanchen Bo, and Guangjie Chen. "Time Series Remote Sensing Data-Based Identification of the Dominant Factor for Inland Lake Surface Area Change: Anthropogenic Activities or Natural Events?" Remote Sensing 12, no. 4 (2020): 612. http://dx.doi.org/10.3390/rs12040612.

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Inland lake variations are considered sensitive indicators of global climate change. However, human activity is playing as a more and more important role in inland lake area variations. Therefore, it is critical to identify whether anthropogenic activity or natural events is the dominant factor in inland lake surface area change. In this study, we proposed a method that combines the Douglas-Peucker simplification algorithm and the bend simplification algorithm to locate major lake surface area disturbances. These disturbances were used to extract the features that been used to classify disturb

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Konôpka, Bohdan, Peter Zach, and Ján Kulfan. "Wind – an important ecological factor and destructive agent in forests." Forestry Journal 62, no. 2 (2016): 123–30. http://dx.doi.org/10.1515/forj-2016-0013.

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AbstractWind is both an ecological provider and disturbance facilitator influences trees and other organisms in forests. Impacts of wind on induvidual trees and forests mainly depend on the strength (or intensity) of the wind and the stability of the trees. Wind causes large-scale damage to forests and serious economical losses for the forestry sector within Europe. Therefore, knowledge of interactions between wind and trees and/or forests provides the baseline for developing adequate prevention or mitigation of the negative consequences associated with wind disturbances in forest ecosystems.

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Wang, Guohui, Yanan Yang, and Shuxin Wang. "Adaptive Digital Disturbance Rejection Controller Design for Underwater Thermal Vehicles." Journal of Marine Science and Engineering 9, no. 4 (2021): 406. http://dx.doi.org/10.3390/jmse9040406.

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Underwater thermal vehicles, as ocean observation tools, are frequently affected by environment disturbances such as waves and currents, which may cause degradation of the observation accuracy of the vehicles. Consequently, it is important to design a controller for a vehicle that can resist ocean disturbance. In this study, an underwater thermal vehicle principle is introduced, and the mathematical model is established in the vertical plane motion. On this basis, an adaptive digital disturbance suppression control method is proposed. For known disturbance parameters, this controller could com

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Goh, Hui Hwang, Ling Liao, Dongdong Zhang, et al. "Denoising Transient Power Quality Disturbances Using an Improved Adaptive Wavelet Threshold Method Based on Energy Optimization." Energies 15, no. 9 (2022): 3081. http://dx.doi.org/10.3390/en15093081.

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Noise significantly reduces the detection accuracy of transient power quality disturbances. It is critical to denoise the disturbance. The purpose of this research is to present an improved wavelet threshold denoising method and an adaptive parameter selection strategy based on energy optimization to address the issue of unclear parameter values in existing improved wavelet threshold methods. To begin, we introduce the peak-to-sum ratio and combine it with an adaptive correction factor to modify the general threshold. After calculating the energy of each layer of wavelet coefficient, the scale

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Nikoofard, Amirhossein, Tor Arne Johansen, Hessam Mahdianfar, and Alexey Pavlov. "Design and Comparison of Constrained MPC With PID Controller for Heave Disturbance Attenuation in Offshore Managed Pressure Drilling Systems." Marine Technology Society Journal 48, no. 2 (2014): 90–103. http://dx.doi.org/10.4031/mtsj.48.2.4.

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AbstractThis paper presents a constrained finite horizon model predictive control (MPC) scheme for regulation of the annular pressure in a well during managed pressure drilling from a floating vessel subject to heave motion. In addition to the robustness of a controller, how to deal with heave disturbances despite uncertainties in the friction factor and bulk modulus is investigated. The stochastic model describing sea waves in the North Sea is used to simulate the heave disturbances. The results show that the closed-loop simulation without disturbance has a fast regulation response, without a

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Xavier, Eduardo de Almeida, Bernardo Antonio Perez da Gama, Tiago Filgueiras Porto, Bruno Lopes Antunes, and Renato Crespo Pereira. "Effects of disturbance area on fouling communities from a tropical environment: Guanabara Bay, Rio de Janeiro, Brazil." Brazilian Journal of Oceanography 56, no. 2 (2008): 73–84. http://dx.doi.org/10.1590/s1679-87592008000200001.

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In marine fouling communities, free space is one of the key limiting resources for settlement of new organisms. In this way, removing biomass through physical disturbances would play an important role in the structure and dynamics of these communities. The disturbance size seems to be a characteristic that influences recolonization patterns, thus affecting species diversity. The aim of this study was to analyze the effects of growing disturbance areas on fouling communities. Fouling panels were allowed to develop for 6 mo. at Guanabara Bay (22°52'S, 043°08'W) prior to a single application of r

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Tan, Joseph S., Annahir N. Cariello, Mickeal Pugh, et al. "Social determinants of sleep disturbance in safety-net primary care: unmet needs, classist discrimination, and anxiety." Family Practice 37, no. 2 (2019): 263–68. http://dx.doi.org/10.1093/fampra/cmz073.

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Abstract Background The 3P model proposes that predisposing, precipitating, and perpetuating factors all play a role in sleep disturbance. Objective The purpose of the current study is to investigate social determinants of sleep disturbance by applying the 3P model to a safety-net primary care setting, specifically by evaluating the role of classism and unmet needs as precipitating factors for sleep disturbance, and anxiety as a perpetuating factor for sleep disturbance. Methods Participants (N = 210) were a convenience sample of racially/ethnically diverse adults over the age of 18 (age M = 4

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Patel, Bhavini. "Investigating Sleep Disturbances in Mild Cognitive Impairment—Implications for Alzheimer’s and Parkinson’s Diseases: A Research Protocol." Undergraduate Research in Natural and Clinical Science and Technology (URNCST) Journal 9, no. 3 (2025): 1–7. https://doi.org/10.26685/urncst.777.

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Introduction: Sleep disturbances are recognized as both an early symptom and contributor to neurodegenerative diseases, including Alzheimer’s and Parkinson’s disease. Disrupted sleep impairs the brain's ability to clear toxic proteins, leading to cognitive decline and the accumulation of biomarkers such as amyloid-beta and alpha-synuclein. Despite evidence linking poor sleep to neurodegeneration, the impact of varying sleep disturbance severities on disease progression in mild cognitive impairment remains unclear. Methods: A longitudinal cohort of 300 participants aged 60 and older, diagnosed

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VAN OIJEN, TIM P., J. G. DANIËL KARSSEN, and MARTIJN WISSE. "THE EFFECT OF CENTER OF MASS OFFSET ON THE DISTURBANCE REJECTION OF RUNNING ROBOTS." International Journal of Humanoid Robotics 10, no. 02 (2013): 1350004. http://dx.doi.org/10.1142/s0219843613500047.

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Running robots often have their center-of-mass (CoM) of the torso located on the hip, to allow for simple control schemes. However, an offset between the CoM and the hip might increase a robot's ability to recover from disturbances. In this simulation study, we investigated the effect of the CoM-location on the largest disturbance that can be corrected within one or two steps. We found that, for one-step recovery strategies, the optimal CoM-location is above the hip for a step-down disturbance and below the hip for a push disturbance. For two-step recovery strategies, we found that the perform

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Knüppel, Konja, and Iwan Nikitin. "Target-Based Evaluation of Disturbances in Production Systems." Advanced Materials Research 1018 (September 2014): 589–96. http://dx.doi.org/10.4028/www.scientific.net/amr.1018.589.

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Ever-increasing networking and complexity make production processes more susceptible to disturbances. Being able to handle disturbances quickly and effectively is an evolving factor of a company's competitiveness. The research project "Nachhaltiges Störgrößenmanagement in produzierenden KMU" (Sustainable disturbance management in producing SMEs), conducted at the Institute for Production Systems and Logistics (IFA), is developing a methodology aimed at helping users identify and initiate actions against production disturbances. One research focus was on developing a causal factor chart of th

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Feng, Chenjiang, and Wenzhen Kuang. "High-speed train speed tracking control based on active disturbance rejection control strategy." Journal of Physics: Conference Series 2246, no. 1 (2022): 012043. http://dx.doi.org/10.1088/1742-6596/2246/1/012043.

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Abstract The speed tracking control of high-speed trains has the characteristics of nonlinearity, time delay, and multi-factor interference. Aiming at this, a train speed tracking algorithm based on active disturbance rejection control strategy is proposed. First, establish a train control model based on the train dynamics model. Secondly, design a second-order active disturbance rejection controller to set and compensate for unknown disturbances, and then convert the known train parameters to the controlled object for system simulation, the target speed curve is tracked, which proves the feas

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Liu, Qiuyu, Ying Yan, Lei Meng, Zhengyu Zhang, and Ping Zhou. "Influence of Airflow Disturbance on the Uniformity of Spin Coating Film Thickness on Large Area Rectangular Substrates." Coatings 12, no. 9 (2022): 1253. http://dx.doi.org/10.3390/coatings12091253.

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Spin coating is widely used to form a uniform film on a solid substrate. Airflow disturbance has been considered as one of the most influential factors of film thickness, especially for spin coating on large area noncircular substrates. However, the exact mechanism of airflow disturbance influence, such as air shear force effect or indirect effects on evaporation, so far, remains ambiguous. In this work, the influence mechanism of airflow disturbance on film uniformity on large rectangular substrates is studied. The experiment with airflow disturbance is artificially introduced and contrasts w

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Luo, Guan Jun, and Wen Xi Fu. "Quantitative Assessment of the Disturbance Factor in Hoek–Brown Formulas." Advanced Materials Research 368-373 (October 2011): 2819–23. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.2819.

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Due to the subjectivity and limitation for estimating the disturbance factor in the Hoek–Brown formulas, this paper proposes the term "the generalized disturbance factor" and points out that this term is more appropriate in describing the degree of disturbance of the Hoek–Brown rock mass. The longitudinal wave velocity is selected to quantify the generalized disturbance factor. The feasibility of the recommended method is examined in this paper by use of the basic data and in-situ testing results of a project.

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Zhao, Min, and Zhihui Kang. "Voltage sag source classification identification based on AST-CEDT." Journal of Computational Methods in Sciences and Engineering 25, no. 1 (2024): 130–45. https://doi.org/10.1177/14727978241299651.

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To satisfy the requirement of the accuracy and efficiency of voltage sag features detection and disturbance source identification introduced by the power quality management, an approach for identifying voltage sag sources based on AST (adaptive S-transform) and CEDT (chaotic ensemble decision tree) is proposed. Firstly, the multi-resolution analysis of single and compound voltage sag disturbance signals is carried out by using AST which can adjust the window width factor adaptively. Then, eight feature quantities of disturbance are extracted from the AST modulus matrix according to the charact

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Sepahvand, Elham, Rostam Jalali, Behnam Khaledi Paveh, and Mansour Rezaei. "Development and Validation of Sleep Disturbance Questionnaire in Patients with Acute Coronary Syndrome." International Scholarly Research Notices 2014 (October 22, 2014): 1–8. http://dx.doi.org/10.1155/2014/978580.

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Background and Objectives. Severe sleep disturbance is a common problem among patients in cardiac care units (CCUs). There are questionnaires to measure sleep disturbances. Therefore, the present study seeks to design a valid and reliable questionnaire to assess sleep disturbance in patients with acute coronary syndrome (ACS) hospitalized in CCUs. Materials and Methods. In the present methodological research, items of the questionnaire were extracted through a systematic review. The validity and reliability of the questionnaires was assessed by face validity, content validity, construct validi

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Bramley, Harry, Alyssa Henson, Mechelle M. Lewis, Lan Kong, Christy Stetter, and Matthew Silvis. "Sleep Disturbance Following Concussion Is a Risk Factor for a Prolonged Recovery." Clinical Pediatrics 56, no. 14 (2016): 1280–85. http://dx.doi.org/10.1177/0009922816681603.

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Sleep disturbance is a common problem following concussion. A retrospective chart review was conducted at a regional concussion clinic on patients 13 to 18 years of age between 2005 and 2011. Statistical analysis evaluated sleep disturbance and duration of concussion, as well as the use and effectiveness of melatonin. A total of 417 patients met inclusion criteria. One hundred twenty-three (34%) reported disturbance in sleep. There was no difference in sleep disturbance based on age, gender, or past number of concussions. Sleep disturbance was associated with a 3- to 4-fold increase in recover

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Zheng, Jian Ye, and Zhi Fu Hu. "Finite Element Method Utilization of Disturbed State Concept Theory on Seepage or Anisotropy." Applied Mechanics and Materials 170-173 (May 2012): 994–1000. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.994.

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Disturbed state concept theory (DSC) utilizes constitutive models to depict material responses. The response is gained by weight-averaging reference responses. DSC also can superpose disturbance factor on reference responses to reach actual response values. Suitable constitutive models give reference responses and DSC revises them to be acceptable outputs. Disturbance factor is independent to constitutive model. On DSC application on seepage problem, combination of DSC and Biot’s consolidation is forwarded by introducing disturbance factor into equilibrium function and extended cam-bridge mode

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Andolfatto, L., M. Morisod, A. Dodier, and N. Gervais. "AI-based approach to predict nozzle instability in Pelton turbine model test." IOP Conference Series: Earth and Environmental Science 1079, no. 1 (2022): 012005. http://dx.doi.org/10.1088/1755-1315/1079/1/012005.

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Abstract Over past experience on reduced scale physical models of Pelton turbines, it has been noticed that a few models exhibited disturbed performance curves over a given domain of speed factor and discharge factor under specific test head values, while the same performance curves were smooth at other test heads. Cross-checking of different model component combinations helped identify that those disturbances occur with specific nozzles independently from other model components. The experienced disturbances have been understood to be consequences of instabilities attributed to the nozzle. Att

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Zhang, Qi, and Caiyue Zhang. "Speed Control of PMSM Based on Fuzzy Active Disturbance Rejection Control under Small Disturbances." Applied Sciences 13, no. 19 (2023): 10775. http://dx.doi.org/10.3390/app131910775.

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Permanent Magnet Synchronous Motors (PMSMs), with their simple design, small size, and high-power factor, are ideally suited for realizing high-power AC drives and are widely used in various industries. In this study, Fuzzy Active Disturbance Rejection Control (Fuzzy-ADRC) is used to control the speed of the PMSM. When a slight external disturbance occurs, this control strategy maintains the suppression characteristics of the self-excited control for the disturbance and enhances its ability to compensate for the disturbance. First, a mathematical model was developed to study the surface mount

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Garimella, S. S., and K. Srinivasan. "Application of Repetitive Control to Eccentricity Compensation in Rolling." Journal of Dynamic Systems, Measurement, and Control 118, no. 4 (1996): 657–64. http://dx.doi.org/10.1115/1.2802340.

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Repetitive control is applied here to compensate for roll eccentricity disturbances in thickness control of the cold rolling process. A unique aspect of the process is that the eccentricity disturbance may be from multiple rolls and hence may be composed of multiple periodic components whose periods may not be commensurate, namely, divisible by a common factor an integral number of times. The paper presents a multiple-period repetitive controller structure that can compensate for such a disturbance. The structure proposed is also applicable to other tracking and regulation applications involvi

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Westen, Drew, Ephi Betan, and Jared A. DeFife. "Identity disturbance in adolescence: Associations with borderline personality disorder." Development and Psychopathology 23, no. 1 (2011): 305–13. http://dx.doi.org/10.1017/s0954579410000817.

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AbstractAlthough establishing a coherent identity is often viewed as a normative developmental task of adolescence, an important question is whether forms of identity disturbance seen in adult personality disorders can also be distinguished in adolescents. If so, such disturbances would constitute an essential target for research and clinical interventions. The goal of this study is to investigate the nature of identity disturbance in an adolescent clinical sample and to explore its links with personality pathology, particularly borderline personality disorder. A national random sample of 139

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Safwan Sadeq, Mark Ovinis, and Saravanan Karuppanan. "Modeling and Simulation of PMSG Wind Energy Conversion System Using Active Disturbance Rejection Control." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 92, no. 1 (2022): 105–22. http://dx.doi.org/10.37934/arfmts.92.1.105122.

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Electrical power generated from wind turbines inherently fluctuates due to changing wind speeds. Without proper control, disturbances such as changing wind speeds can degrade the power quality factor and robustness of the electrical grid. To ensure good power quality factor, high performance and robustness of the grid against internal and external disturbances, the use of Active Disturbance Rejection Control with an extended state observer ESO for a PMSG Wind Energy Conversion System is investigated. The system has been simulated in MATLAB/Simulink at various wind speeds. The obtained simulati

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Soldatini, Cecilia, Yuri V. Albores-Barajas, Marcello Tagliavia, Bruno Massa, Leonida Fusani, and Virginie Canoine. "Effects of human disturbance on cave-nesting seabirds: the case of the storm petrel." Conservation Physiology 3, no. 1 (2015): cov041. https://doi.org/10.5281/zenodo.13509984.

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(Uploaded by Plazi for the Bat Literature Project) Human disturbance is an important stress factor with potentially strong impact on breeding activity in animals. The consequences can be extinction of the breeding population, because disturbed animals might desert their breeding area and find no suitable substitute area. In this study, we investigated the effects of anthropogenic disturbance on a breeding population of Mediterranean storm petrels. Seabirds are increasingly used as bio-indicators for sea environmental parameters, because they are very sensitive to changing conditions. Burrowing

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Soldatini, Cecilia, Yuri V. Albores-Barajas, Marcello Tagliavia, Bruno Massa, Leonida Fusani, and Virginie Canoine. "Effects of human disturbance on cave-nesting seabirds: the case of the storm petrel." Conservation Physiology 3, no. 1 (2015): cov041. https://doi.org/10.5281/zenodo.13509984.

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(Uploaded by Plazi for the Bat Literature Project) Human disturbance is an important stress factor with potentially strong impact on breeding activity in animals. The consequences can be extinction of the breeding population, because disturbed animals might desert their breeding area and find no suitable substitute area. In this study, we investigated the effects of anthropogenic disturbance on a breeding population of Mediterranean storm petrels. Seabirds are increasingly used as bio-indicators for sea environmental parameters, because they are very sensitive to changing conditions. Burrowing

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Soldatini, Cecilia, Yuri V. Albores-Barajas, Marcello Tagliavia, Bruno Massa, Leonida Fusani, and Virginie Canoine. "Effects of human disturbance on cave-nesting seabirds: the case of the storm petrel." Conservation Physiology 3, no. 1 (2015): cov041. https://doi.org/10.5281/zenodo.13509984.

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(Uploaded by Plazi for the Bat Literature Project) Human disturbance is an important stress factor with potentially strong impact on breeding activity in animals. The consequences can be extinction of the breeding population, because disturbed animals might desert their breeding area and find no suitable substitute area. In this study, we investigated the effects of anthropogenic disturbance on a breeding population of Mediterranean storm petrels. Seabirds are increasingly used as bio-indicators for sea environmental parameters, because they are very sensitive to changing conditions. Burrowing

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Soldatini, Cecilia, Yuri V. Albores-Barajas, Marcello Tagliavia, Bruno Massa, Leonida Fusani, and Virginie Canoine. "Effects of human disturbance on cave-nesting seabirds: the case of the storm petrel." Conservation Physiology 3, no. 1 (2015): cov041. https://doi.org/10.5281/zenodo.13509984.

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(Uploaded by Plazi for the Bat Literature Project) Human disturbance is an important stress factor with potentially strong impact on breeding activity in animals. The consequences can be extinction of the breeding population, because disturbed animals might desert their breeding area and find no suitable substitute area. In this study, we investigated the effects of anthropogenic disturbance on a breeding population of Mediterranean storm petrels. Seabirds are increasingly used as bio-indicators for sea environmental parameters, because they are very sensitive to changing conditions. Burrowing

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Guo, Yaning, Qi Sun, and Quan Pan. "Robust Tracking Control of Underactuated UAVs Based on Zero-Sum Differential Games." Drones 9, no. 7 (2025): 477. https://doi.org/10.3390/drones9070477.

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This paper investigates the robust tracking control of unmanned aerial vehicles (UAVs) against external time-varying disturbances. First, by introducing a virtual position controller, we innovatively decouple the UAV dynamics into independent position and attitude error subsystems, transforming the robust tracking problem into two zero-sum differential games. This approach contrasts with conventional methods by treating disturbances as strategic “players”, enabling a systematic framework to address both external disturbances and model uncertainties. Second, we develop an integral reinforcement

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Dagdelenler, Gulseren, and Harun Sonmez. "A Practical Quantitative Tool Based on the EXCASS System for the Use of Hoek-Brown’s Disturbance Factor in Slope Excavations." Applied Sciences 15, no. 12 (2025): 6714. https://doi.org/10.3390/app15126714.

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The disturbance factor (D) in the Hoek–Brown criterion quantifies excavation-induced rock mass disturbance. Although D is conceptually defined as a continuous parameter ranging from 0 to 1, the most recent Hoek–Brown guidelines provide descriptions only for boundary conditions related to slopes and tunnels. In slope excavations, the degree of disturbance is governed not only by the excavation method but also by the thickness of the removed overburden, with its influence becoming particularly significant in deep excavations. In recent years, the concept of a transitional disturbance factor, var

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Marangon Jardim, Juliana, Carolina Marangon Jardim, and Jorge Luiz Colodette. "Understanding the pulping and bleaching performances of eucalyptus woods affected by physiological disturbance." November 2018 17, no. 11 (2018): 633–42. http://dx.doi.org/10.32964/tj17.11.633.

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The wood quality is a factor of extreme importance when the pulping process is targeting high yield, low cost, and high pulp quality. Thus, wood knowledge is crucial for process optimization. In some northeastern Brazilian eucalyptus plantations, a physiological disturbance caused by water stress has been observed. Up to now, there have been no studies concerning the effects of such disturbances on the wood quality or on the pulping and bleaching process performance. The present work is aimed at understanding the impact of the stress on the production of bleached pulp. The wood quality of two

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Griffin, Sarah, Baylor Williams, Scott Ravyts, Joseph Dzierzewski, and Bruce Rybarczyk. "LONELINESS PREDICTS REDUCTIONS IN SLEEP QUALITY IN OLDER AMERICANS." Innovation in Aging 3, Supplement_1 (2019): S529. http://dx.doi.org/10.1093/geroni/igz038.1946.

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Abstract Research documenting loneliness as a factor predicting health decline accumulates, yet the mechanisms underlying this relationship remain obscure. A potential mechanism is sleep disturbance, which is associated with loneliness. However, it remains unclear whether loneliness is a risk factor for subsequent sleep disturbance. The present study aimed to examine loneliness (measured via the Hughes Loneliness Scale) as a risk factor for sleep disturbance in a nationally representative sample of older (&gt;65) Americans. Weighted linear regressions (accounting for complex sampling) were

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Dong, Lu, Laura Bogart, David Klein, Matt Mutchler, Sean Lawrence, and David Pantalone. "0255 Associations Between Coping with Discrimination, Sleep, and Mental Health Among Black Sexual Minority Men." SLEEP 47, Supplement_1 (2024): A110. http://dx.doi.org/10.1093/sleep/zsae067.0255.

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Abstract Introduction Black sexual minority men (SMM) suffer disproportionately from health inequities, including high rates of HIV, as well as poor mental and physical health. In addition to intersectional stigma and discrimination, sleep health, an understudied factor, may contribute to these health inequities. We examined the associations between coping with discrimination, sleep disturbances, and mental and behavioral health outcomes among Black SMM. Methods We recruited 191 Black SMM participants both in person at community-based events and organizations and online. Sleep disturbance, dep

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Dagdelenler, Gulseren. "Impact of Rock Mass Strength Anisotropy with Depth on Slope Stability Under Excavation Disturbance." Applied Sciences 15, no. 1 (2024): 164. https://doi.org/10.3390/app15010164.

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In open-pit excavations, overburden rock mass is disturbed by processes like blasting and mechanical excavation, leading to a reduction in mechanical properties. Accounting for this disturbance is essential for ensuring slope stability, optimizing costs, and maintaining feasibility. The Hoek–Brown failure criterion, a widely used empirical method in rock mechanics, incorporates the disturbance factor to reflect the reduction in rock mass strength after disturbance. This study reviews five approaches from the literature regarding the role of disturbance in rock mechanics, focusing on its impact

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Nursalam, Nursalam, Arie Sunarno, and Rahmatul Fitriyah. "Hubungan Shift Kerja dengan Stres Kerja dan Circadian Rhythm Perawat." Jurnal Ners 2, no. 2 (2017): 134–40. http://dx.doi.org/10.20473/jn.v2i2.4970.

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Introduction: Shift work, primarily night shift may worsen some health disturbances because it changes especially circadian rhythm. Therefore, it may lead to sleep disturbance, increased vital signs (heart rate, respiration rate and blood pressure), bowel disturbance, reaction times, conscious stage and increased work stress. The objective of this study was to analyze the correlation between shift work and Nurse’s circadian rhythm. Method: These study was cross sectional with nurses in Flamboyant Intermediate Surgical Ward Dr. Soetomo Hospital Surabaya as subjects. Samples were recruited by us

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Lin, Yuh-Lang, Katie E. Robertson, and Christopher M. Hill. "Origin and Propagation of a Disturbance Associated with an African Easterly Wave as a Precursor of Hurricane Alberto (2000)." Monthly Weather Review 133, no. 11 (2005): 3276–98. http://dx.doi.org/10.1175/mwr3035.1.

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Abstract In this study, it is proposed that mesoscale convective complexes (MCCs) and a mesovortex (MV) were embedded within a wavelike disturbance over North Africa that led to the genesis of Hurricane Alberto (2000). The wavelike disturbance observed may be classified as an African easterly wave (AEW). Based on the cloud-top area and brightness values observed from infrared satellite data, four genesis and three lysis stages are identified within a cycle of moist convection associated with the pre-Alberto disturbance. The availability of water vapor is the most essential factor controlling t

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Zhong, Yichang, Kangkang Zheng, Shiqi Shen, Qiuyue Xie, Zhengang Xiao, and Yutao Liu. "An Improved Sliding Mode Control Using Disturbance Observer for Axial Permanent Magnet Synchronous Motor with Dual-Rotating Rotors." Energies 18, no. 11 (2025): 2858. https://doi.org/10.3390/en18112858.

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The twin propeller system can be powered by a motor with dual-rotating rotors, which generally necessitates that both rotors run at the same speed to prevent rolling. The motor with dual-rotating rotors is popular for applications that benefit from high torque density and an axially compact form factor. In order to minimize the effects of load disturbances and internal parameter perturbations on the motor performance, this paper proposes a control strategy combining disturbance observer and sliding mode control (SMC) technologies to realize the purpose of both rotors rotating at the same speed

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Buitron, Victor, Ariel Gianukakis, Jared Saletin, Anthony Spirito, Anne Walters, and Justin Parent. "0683 Sleep disturbance, social functioning, and suicidal ideation among preadolescent children admitted to intensive psychiatric care." SLEEP 46, Supplement_1 (2023): A300—A301. http://dx.doi.org/10.1093/sleep/zsad077.0683.

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Abstract Introduction Research on preadolescent childhood suicidality is sparse, with recent population-based studies providing support for sociodemographic and diagnostic correlates of preadolescent suicidal ideation. Sleep disturbance is of particular interest in the examination of preadolescent suicidal ideation because sleep health is interlinked with childhood psychosocial functioning; further, there are changes in preadolescent homeostatic regulation of sleep-wake and intrinsic circadian rhythm (i.e., delayed sleep onset), and psychosocial pressures in preadolescence, such as bedtime aut

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Nguyen, Tuan Anh. "Active disturbance rejection control based on soft computing techniques for electric power steering to improve system performance." PLOS One 20, no. 6 (2025): e0324600. https://doi.org/10.1371/journal.pone.0324600.

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Electric Power Steering (EPS) systems enhance driving comfort and safety. However, their performance often degrades under varying operating conditions due to external disturbances and modeling uncertainties. Traditional control methods, which typically rely on fixed parameters or neglect disturbance dynamics, struggle to maintain robustness and adaptability across diverse scenarios. This article presents an improved control strategy integrating Active Disturbance Rejection Control (ADRC) with advanced soft computing techniques to address these challenges. The proposed method introduces two key

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Bauer, Michael, Roger S. McIntyre, Johan Szamosi, and Hans Eriksson. "Evaluation of adjunct extended-release quetiapine fumarate on sleep disturbance and quality in patients with major depressive disorder and an inadequate response to on-going antidepressant therapy." International Journal of Neuropsychopharmacology 16, no. 8 (2013): 1755–65. http://dx.doi.org/10.1017/s146114571300031x.

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Abstract Sleep disturbance is common in depression and is a risk factor for recurrence and suicide. This analysis evaluated the effects of adjunct extended-release quetiapine fumarate (quetiapine XR) on sleep disturbance and quality in patients with major depressive disorder (MDD) and an inadequate response to on-going antidepressant therapy. Pooled data from two 6-wk, randomized, double-blind, placebo-controlled trials were analysed post hoc. Patients received once-daily quetiapine XR [(150 mg/d), n = 309; (300 mg/d), n = 307] or placebo (n = 303) adjunct to on-going antidepressant therapy. A

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Bond-Lamberty, B., J. Fisk, J. A. Holm, V. Bailey, and C. M. Gough. "Moderate forest disturbance as a stringent test for gap and big-leaf models." Biogeosciences Discussions 11, no. 7 (2014): 11217–48. http://dx.doi.org/10.5194/bgd-11-11217-2014.

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Abstract. Disturbance-induced tree mortality is a key factor regulating the carbon balance of a forest, but tree mortality and its subsequent effects are poorly represented processes in terrestrial ecosystem models. In particular, it is unclear whether models can robustly simulate moderate (non-catastrophic) disturbances, which tend to increase biological and structural complexity and are increasingly common in aging US forests. We tested whether three forest ecosystem models – Biome-BGC, a classic big-leaf model, and the ED and ZELIG gap-oriented models – could reproduce the resilience to mod

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Starker, Steven. "Daydreams, Nightmares, and Insomnia: The Relation of Waking Fantasy to Sleep Disturbances." Imagination, Cognition and Personality 4, no. 3 (1985): 237–48. http://dx.doi.org/10.2190/yava-j6bj-ga7c-cvrk.

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College students were administered an abbreviated form of the Imaginal Processes Inventory along with scales of sleep disturbance, positive mood, and dream recall. Results confirmed the earlier report by Starker and Hasenfeld that sleep disturbances were significantly associated with dysphoric patterns of daydreaming, and not associated with a positive daydreaming pattern. Correlational, factor-analytic and multiple linear regression analyses revealed sex differences possibly related to differential sensitivity to inner experience.

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Abalorio, Bridget, and Grace Mwangi. "The Role of Parental Attachment and Academic Stress in Predicting Adolescent Sleep Disturbance." Journal of Adolescent and Youth Psychological Studies 5, no. 8 (2024): 157–65. https://doi.org/10.61838/kman.jayps.5.8.17.

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Objective: This study aimed to investigate the predictive roles of parental attachment and academic stress on sleep disturbance among adolescents in Kenya. Methods and Materials: The study utilized a correlational descriptive design involving 382 high school students from Kenya, selected based on the Morgan and Krejcie sample size determination table. Standardized instruments were used to assess the variables: the Sleep Disturbance Scale for Children (SDSC) for sleep disturbance, the Inventory of Parent and Peer Attachment (IPPA) for parental attachment, and the Academic Stress Scale (ASS) for

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Zhang, Yuqi, Zhihu Sun, and Sainan Yin. "Response of Soil Physicochemical Properties and Microbial Community Composition in Larix olgensis Plantations to Disturbance by a Large Outbreak of Bark Beetle." Forests 15, no. 4 (2024): 677. http://dx.doi.org/10.3390/f15040677.

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Forests are affected by a wide range of disturbances globally, resulting in the decline or death of large areas of them. There is a lack of comparative studies on how soil properties change in forests that die under the influence of disturbances, especially considering different levels of disturbance. For this study, we took Larix olgensis—a major plantation forest species in northeast China—as the research object, one in which a large outbreak of bark beetle led to large-scale forest death, and set up fixed sample plots characterized by different disturbance intensities. We investigated the r

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Li, Jiaxun, Xi Chen, Kang Niu, and Jianqiao Yu. "Finite-Time Tracking Control Based on Immersion and Invariance with Dynamically Scaling Factor for Agile Missiles." Aerospace 9, no. 11 (2022): 674. http://dx.doi.org/10.3390/aerospace9110674.

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A novel finite-time tracking control algorithm with disturbances observer is investigated for agile missiles in the presence of mismatched and matched disturbances. A finite-time disturbance observer with the continuous super-twisting algorithm is designed to quickly estimate the mismatched and matched disturbances. An adaptive law on the basis of immersion and invariance theory (I&I) is proposed to estimate the uncertainty of aerodynamics and compensate for the inaccuracy of modeling. An adaptive dynamic scaling factor supervised by a designed supervision factor is implemented. Moreover,

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Mao, Mingjiang, Lingyan Wei, Wenfeng Gong, Genghong Wu, and Tiedong Liu. "Impacts of Spatio-Temporal Changes in Anthropogenic Disturbances on Landscape Patterns in the Nandu River Basin, China." Sustainability 16, no. 7 (2024): 2724. http://dx.doi.org/10.3390/su16072724.

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We explored the characteristics of landscape pattern (LP) changes in the Nandu River Basin (NRB) and its dynamic response mechanism to anthropogenic disturbance (AD). This is important for ecological protection and for land use decision-making in the basin in the context of the construction of a free trade port. Land use and land cover change (LULCC) data of 1990, 2000, 2010, and 2020 were analyzed with the help of the LP index, moving window method, hemeroby index, geo-information atlas, and geographic information system (GIS) spatial analysis to reveal the dynamic changes in LP characteristi

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Xinyu, Wen, Zhang Junjie, and Yao Xiuming. "Estimation and rejection of sinusoidal disturbance with unknown frequency using cascade disturbance observer." Transactions of the Institute of Measurement and Control 43, no. 12 (2021): 2647–57. http://dx.doi.org/10.1177/01423312211002799.

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A disturbance rejection approach is presented for a class of uncertain systems subject to sinusoidal disturbance with unknown frequency. The proposed disturbance estimation method includes two types of observers that are connected in cascade form. The disturbance property is excited through an auxiliary filter, and then a frequency factor observer is constructed to generate the information required by full-order state observer. Thus, with the disturbance and system state estimation values, the composite control structure including a cascade disturbance observer (CDO) and a robust feedback cont

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Gao, Xun, Jie Meng, Yi Qun Li, Ying Wang, and Wen Chao Zhang. "Analysis of Large Disturbance Dynamic Stability Process." Applied Mechanics and Materials 536-537 (April 2014): 1301–5. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.1301.

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if the power system is disturbed by a large disturbance, its damping characteristics would change due to the nonlinear factor during the dynamic process and the redistribution of power flow after the accident operation mode. In this paper, the impact of operation mode after an accident and the nonlinear factor for large disturbance dynamic stability of grid are studied respectively. And then, by simulation comparison, it concludes that if nonlinear parts of automatic regulating devices have little impact on the grid damping characteristics after the grid suffers large disturbance, large distur

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Vera y Conde, C. F., and C. F. D. Rocha. "Habitat disturbance and small mammal richness and diversity in an Atlantic rainforest area in southeastern Brazil." Brazilian Journal of Biology 66, no. 4 (2006): 983–90. http://dx.doi.org/10.1590/s1519-69842006000600005.

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Since disturbance is an important ecological factor affecting species diversity in natural environments, the increasing human occupation rate in Brazilian Atlantic rainforest, which supports about 50% of Brazil's human population, has resulted in intense habitat degradation and fragmentation. Within this rainforest, animal and plant species have been lost at a high rate, and biological and diversity is presently vulnerable. Various animals community studies along a gradient of environmental disturbances have shown that the highest species diversities occur in habitats with intermediate levels

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Deng, Jiuqiang, Wei Ren, Hanwen Zhang, Yong Luo, Xi Zhou, and Yao Mao. "A Modified Disturbance Observer Structure Based on Acceleration Measurement for Disturbance Suppression in Tracking Control System." Applied Sciences 8, no. 9 (2018): 1571. http://dx.doi.org/10.3390/app8091571.

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The micro-electro-mechanical system (MEMS) accelerometer is widely adopted in many engineering control systems due to its extraordinary performance with high bandwidth, small size and low weight. However, massive drift caused by its insensitively at low frequency is the main factor which limits its performance. It leads to integral saturation when the feedforward method is used and hinders the improvement of disturbance suppression ability at low frequency, which is a significant factor for evaluating the closed-loop performance of a high-precision tracking system. To solve this problem, a mod

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Samardzic, Marko, Nikola Repac, Igor Nikolic, et al. "Diagnostic and predictive factors of perioperative comorbidities in the treatment of hydrocephalus." Acta chirurgica Iugoslavica 61, no. 4 (2014): 21–25. http://dx.doi.org/10.2298/aci1404021s.

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Introduction: The objective of this study was to demonstrate the predictive value and the presence of diagnostic comorbidity and perioperative factors in the outcome of shunt surgery for hydrocephalus. Methods: We retrospectively analyzed a series of 32 patients who underwent surgery for NTH on Neurosurgical Service KBC Zemun in the 2006-2012 period year. Diagnostic factors were analyzed: clinical signs (gait disturbance, cognitive deficits and incontinence), Evans' index and lumbar puncture. Perioperative comorbidity factors analyzed were: arterial hypertension, diabetes mellitus, and cerebro

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Trivedi, Madhukar H., Borwin Bandelow, Koen Demyttenaere, et al. "Evaluation of the effects of extended release quetiapine fumarate monotherapy on sleep disturbance in patients with major depressive disorder: a pooled analysis of four randomized acute studies." International Journal of Neuropsychopharmacology 16, no. 8 (2013): 1733–44. http://dx.doi.org/10.1017/s146114571300028x.

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Abstract Effects of once-daily extended-release quetiapine fumarate (quetiapine XR) monotherapy on sleep quality and disturbance in patients with major depressive disorder (MDD) were evaluated. Pooled data from four 6- or 8-wk placebo-controlled quetiapine XR (50–300 mg/d) monotherapy studies (D1448C00001; D1448C00002; D1448C00003; D1448C00004) were analysed. Primary efficacy end-point was change from randomization in Montgomery Åsberg Depression Rating Scale (MADRS) score. Post hoc analyses of secondary end-points were conducted for change from randomization in: MADRS item 4 (reduced sleep);

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